use lazy_static::lazy_static;
use x86_64::structures::idt::{InterruptDescriptorTable, InterruptStackFrame};

use crate::println;

lazy_static! {
  static ref IDT: InterruptDescriptorTable = {
    let mut idt = InterruptDescriptorTable::new();
    idt.breakpoint.set_handler_fn(breakpoint_handler);
    idt.double_fault.set_handler_fn(double_fault_handler);
    idt
  };
}

pub fn init_idt() {
  IDT.load();
}

extern "x86-interrupt" fn double_fault_handler(
  stack_frame: InterruptStackFrame, _error_code: u64) -> !
{
  panic!("EXCEPTION: DOUBLE FAULT\n{:#?}", stack_frame);
}

extern "x86-interrupt" fn breakpoint_handler(
  stack_frame: InterruptStackFrame)
{
  println!("EXCEPTION: BREAKPOINT\n{:#?}", stack_frame);
}

#[test_case]
fn test_breakpoint_exception() {
  // invoke a breakpoint exception
  x86_64::instructions::interrupts::int3();
}
